Rock 360 by Ab Trainer (Black) - 360 Degree Abdominal Roller Wheel with Phone Clip Includes 10 DVDs, a knee mat, FREE phone app available on iPhone and Android, phone clip attachment, nutrition guide, design chart and 60-Day Challenge 360 degree motion works all 29 muscles of the core simultaneously for more defined abdominal muscles Efficiently and functionally improve your core strength while burning away belly fat with nonstop abs ripping movements Supercharge your metabolism! Appropriate for all fitness levels, beginner to advanced Use the Rock 360 on any floor surface and to get the most out of your abdominal exercise routine Includes 10 DVDs, a knee mat, No Charge phone app available on iPhone and Android, phone clip attachment, nutrition guide, design chart and 60-Day Challenge. 360 degree motion works all 29 muscles of the core simultaneously for more defined abdominal muscles. Efficiently and functionally improve your core strength while burning away belly fat with nonstop abs ripping movements. Supercharge your metabolism. Appropriate for all fitness levels, from beginner to advanced. Use the Rock 360 on any floor surface and to get the most out of your abdominal exercise routine.